<template>
  <div>
      <!-- 面包屑导航栏 -->
    <el-breadcrumb>
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>用户管理</el-breadcrumb-item>
        <el-breadcrumb-item>用户列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <el-row>
            <el-col>
                <el-button type="primary" @click="showAddCateDialog">添加商品</el-button>
            </el-col>
        </el-row>

        <!-- 表格 -->
        <tree-table :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-row-hover="false"
        show-index
        index-text="#"
        border
        class="treeTable"

        >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>

        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>

        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="editCate(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.cat_id)">删除</el-button>
        </template>

        </tree-table>
        <!-- 分页 -->
        <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 7, 9]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
        </el-pagination>

    </el-card>

    <!-- 添加商品对话框 -->
    <el-dialog
    title="添加商品"
    :visible.sync="addCateDialogVisible"
    width="50%"
    @close="addCateDialogClosed"
    
    >
        <el-form :model="cateForm" :rules="addCateRules" ref="addCateFormRef" label-width="100px">
            <el-form-item label="商品名称" prop="cat_name">
                <el-input v-model="cateForm.cat_name"></el-input>
            </el-form-item>
            <el-form-item label="父级分类">
                <el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys" @change="parentCateChanged" clearable change-on-select >
                </el-cascader>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改分类对话框 -->
    <el-dialog
    title="提示"
    :visible.sync="editDialogVisible"
    width="30%"

    
    >
    <el-form ref="editFormRef" :model="editForm" label-width="70px">
            <el-form-item label="分类名称" prop="cat_name" >
                <el-input v-model="editForm.cat_name"></el-input>
            </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveCateInfo">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            queryInfo:{
                type:3,
                pagenum:1,
                pagesize:5
            },
            cateList:[],
            total:0,
            columns:[
                {
                    label: '分类名称',
                    prop: 'cat_name',
                },
                {
                    label: '是否有效',
                    type: 'template',
                    template: 'isok',
                },
                {
                    label: '排序',
                    type: 'template',
                    template: 'order',
                },
                {
                    label: '操作',
                    type: 'template',
                    template: 'opt',
                }
            ],
            // 控制添加商品对话框的显示与隐藏
            addCateDialogVisible:false,
            // 添加商品内容
            cateForm:{
                cat_pid:0,
                cat_name:'',
                cat_level:0
            },  
            // 添加商品规则
            addCateRules:{
                cat_name:[
                    { required: true, message: '请输入分类名称', trigger: 'blur' }
                ]
            },
             // 父级分类的列表
            parentCateList: [],
            // 指定级联选择器的配置对象
            cascaderProps:{
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 选中的父级分类的Id数组
            selectedKeys:[],

            //控制修改分类对话框
            editDialogVisible:false,
            editForm:{
                cat_id:0,
                cat_name:''
            }
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res} =  await this.$http.get('categories',{params:this.queryInfo})
            if(res.meta.status!==200){
                return this.$message.error('商品列表获取失败')
            }
            this.cateList = res.data.result
            this.total = res.data.total

        },
        //监听pagesize改变 就是每页显示多少条
        handleSizeChange(newSize){
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        //监听页码改变
        handleCurrentChange(newPage){
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
        //添加商品按钮
        showAddCateDialog(){
            // 先获取父级分类的数据列表
            this.getParentCateList()
            // 再展示出对话框
            this.addCateDialogVisible = true
        },
        // 获取父级分类的数据列表
        async getParentCateList() {
        const { data: res } = await this.$http.get('categories', {
            params: { type: 2 }
        })

        if (res.meta.status !== 200) {
            return this.$message.error('获取父级分类数据失败！')
        }


        this.parentCateList = res.data
        },

        // 选择项发生变化触发这个函数
        parentCateChanged(){
            console.log(this.selectedKeys)
            // 如果 selectedKeys 数组中的 length 大于0，证明选中的父级分类
            // 反之，就说明没有选中任何父级分类
            if (this.selectedKeys.length > 0) {
                // 父级分类的Id
                this.cateForm.cat_pid = this.selectedKeys[
                this.selectedKeys.length - 1
                ]
                // 为当前分类的等级赋值
                this.cateForm.cat_level = this.selectedKeys.length
                return
            } else {
                // 父级分类的Id
                this.cateForm.cat_pid = 0
                // 为当前分类的等级赋值
                this.cateForm.cat_level = 0
            }
        },
         // 点击按钮，添加新的分类
        addCate() {
            console.log(this.cateForm);
            this.$refs.addCateFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(
                'categories',
                this.cateForm
                )

                if (res.meta.status !== 201) {
                return this.$message.error('添加分类失败！'+res.meta.msg)
                }

                this.$message.success('添加分类成功！')
                this.getCateList()
                this.addCateDialogVisible = false
            })
        },
        addCateDialogClosed(){
             // 监听对话框的关闭事件，重置表单数据
             this.$refs.addCateFormRef.resetFields()
             this.selectedKeys = []
             this.cateForm.cat_pid = 0
             this.cateForm.cat_level = 0
        },
        // 点击编辑按钮
        async editCate(id){
            this.editDialogVisible = true
            const{data:res} = await this.$http.get('categories/'+id)
            this.editForm = res.data
        },
        // 确认提交修改分类
        async saveCateInfo(){
                const{data:res} = await this.$http.put('categories/'+this.editForm.cat_id,
                {id:this.editForm.cat_id,
                 cat_name:this.editForm.cat_name,
                })
                if(res.meta.status!==200) return this.$message.error('修改失败')
                this.editDialogVisible = false
                this.getCateList()
                this.$message.success('修改成功')
        },
        // 点击删除按钮
        async removeCateById(id){
            const confirmResult = await this.$confirm(
            '此操作将永久删除该分类, 是否继续?', 
            '提示', 
            {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)

            // 如果用户点击了确定返回字符串 confirm
            // 如果用户点击了取消返回字符串 cancel
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除')
            }
            const {data:res} =  await this.$http.delete('categories/' + id)
            if(res.meta.status!==200) return this.$message.error('删除失败')
            this.$message.success('删除成功')
            this.getCateList()
        }

    }
}
</script>

<style>
.treeTable{
    margin-top: 10px;
}
.el-cascader{
    width: 100%;
}
.el-cascader-panel{
    height: 300px;
}
</style>